docs: def set_key_color(self, color: Tuple[int, int, int]) -> None:
          """Set a color to be transparent during blitting functions.
  
          Args:
              color (Union[Tuple[int, int, int], Sequence[int]]):
                  An (r, g, b) sequence or Color instance.
          """
          lib.TCOD_image_set_key_color(self.image_c, color)